2c6h5oh+2na=2c6h5ona+h2
V(H2)=6.72л
найти массу (c6h5oh)

n(H2)=v/Vm=6.72/22,4=0.3 мольn(h2)/n(c6h5oh)=2/1n(c6h5oh)=2n(h2)=0.3*2=0.6мольm(c6h5oh)=n*M=94*0.6=57.6